/*
 * Copyright 2009 Cedric Priscal
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.shirley.serialportlib;

import java.io.File;
import java.io.FileDescriptor;

public class SerialPort {

    /**
     * chmod 666 means that all users can read and write but cannot execute
     * @param device
     * @return
     */
    boolean chmod666(File device) {
        if (device == null || !device.exists()) {
            return false;
        }
        try {
            /* Missing read/write permission, trying to chmod the file */
            Process su;
            su = Runtime.getRuntime().exec("/system/bin/su");
            String cmd = "chmod 666 " + device.getAbsolutePath() + "\n"
                    + "exit\n";
            su.getOutputStream().write(cmd.getBytes());
            if (su.waitFor() == 0 && device.canRead() && device.canWrite()) {
                return true;
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return false;
    }

    // JNI
    protected native static FileDescriptor open(String path, int baudrate, int flags);

    protected native void close();

    static {
        System.loadLibrary("SerialPort");
    }
}
